\begin{table}%t5
\caption{Published "white light'' 
polarization data for the verification objects.\label{tab:conf}}
%\centerline
{\begin{tabular}{lllrrl}
\hline \hline\\[-0.10in]
Object & $p_l$ & $\sigma_{p_l}$ & $\theta_l$ & $\sigma_{\theta_l}$ & Ref.\\
       & (\%)  &  (\%)          & (\degr)    &  (\degr) &
\\[0.05in] \hline \\[-0.10in]
\object{PG 0946+301} & 0.85 & 0.14 & 116 & 5 & 1, 2\\
\object{PG 1004+130} & 0.79 & 0.11 & 77 & 4 & 2\\
\object{PG 1012+008} & 0.66 & 0.23 & 98 & 10 & 2\\
\object{PKS 1049-09} & 0.85 & 0.30 & 96 & 10 & 2\\
\object{PG 1216+069} & 0.80 & 0.19 & 53 & 7 & 2\\
\object{TON 1530} & 0.84 & 0.24 & 150 & 8& 2 \\
\object{PG 1254+047} & 1.22 & 0.15 & 165 & 3& 2, 1\\
\object{PG 1435-067} & 1.44 & 0.29 & 27 & 6& 2\\
\object{2MA 1519+1838}& 0.67 & 0.22 & 132 & 11& 3\\
\object{2MA 1543+1937}& 1.33 & 0.26 & 30 & 6 &3\\
\object{3C 323.1} & 1.03 & 0.20 & 4 & 5 &2 \\
\object{MARK 877} & 0.94 & 0.17 & 79 & 5 &2 \\
\object{2MA J1714+2602}& 0.86 & 0.33 & 65 & 12 &3 \\ 
\hline
\end{tabular}}
\par
\smallskip
References: (1) Schmidt \& Hines
({\cite{SCH99}}); (2) Berriman et~al. ({\cite{BER90}}); (3)~Smith 
et~al. ({\cite{SMI02}}).  When more than one measurement is available
(cf. \object{PG 0946+301} and \object{PG 1254+047}), the value with the smallest
$\sigma_{p_l}$ is given.
\end{table}